Cylinder ridge hone



A g- 1967 A. L. VON TERSCH CYLINDER RIDGE BONE Filed Sept. 8, 1964 United States PatentO 3,334,453 CYLINDER RIDGE HONE Alfred L. van Tersch, Maryville, Mm, assignor to Lisle Corporation, Clarinda, Iowa, a corporation of Iowa Filed Sept. 8, 1964, Ser. No. 394,995 3 Claims. (Cl. 51--353) This invention relates to a cylinder ridge hone of the type adapted for rotation by an electric drill or the like and cooperable with a cylinder bore of an internal combustion engine or the like for support on the upper end of the cylinder, the hone being operable to hone away the ridge adjacent the upper end of the cylinder formed above the top piston ring as a result of ring wear in the cylinder.

One object of the invention is to provide specially de signed cylinder ridge-removing hone elements which can be pivoted to hone-carrying arms of a tool of the type shown in Brooks Patent No. 2,736,146 in place of the cylinder hone elements shown in the patent.

Another object is to provide hone carriers which take advantage of the expansion bias of hone-carrying arms to properly support cylinder ridge honing members with respect to the bore of a cylinder during rotation of the tool and which feed the hones against the ridge in such manner as to hone it away as a result of such rotation.

A further object is to provide hone element carriers pivoted to the hone-carrying arms of an arm supporting head, which carriers have a first portion adapted to enter a cylinder bore and provided with a contact element to engage the bore adjacent a ridge thereof, and a second portion provided with supporting means adapted to contact and ride upon the upper end of the cylinder when the head is rotated.

Still a further object is to provide supporting means for the hone carriers in the form of rollers adapted to contact and ride the upper end of the cylinder surrounding the bore therein whereby the honing elements are at all times supported in proper operating position during the rotation of the tool.

An additional object is to provide a relationship between the honing element and the contact element such that the honing element produces a conical shape to the portion of the cylinder bore in place of the ridge thereof when the honing operation has been completed.

Another additional object is to provide honing element carriers which have shoulders facing the direction of rotation so that honing elements cemented to the hone carriers may be backed up during operation by such shoulders.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my cylinder ridge hone, whereby the objects above contemplated are attained, as hereinafter more fully set forth, pointed out in my claims and illustrated in detail on the accompanying drawing, wherein:

FIG. 1 is a perspective View of a cylinder ridge hone embodying my invention;

FIG. 2 is a side elevation of a portion thereof showing a honing element coacting with a cylinder bore and ridge (shown in section), a portion of the tool being shown in section to illustrate details;

FIG. 3 is a view similar to a portion of FIG. 2 showing the final position of a honing element after the ridge has been honed away and the resulting taper of the cylinder bore in place thereof;

FIG. 4 is a horizontal sectional view on the line 44 of FIG. 2, and

FIG. 5 is a sectional view similar to a portion of FIG. 4 showing a modification.

On the accompanying drawing I have used the reference character H to indicate in general a tool head of the kind shown in the Brooks patent above mentioned. In general, the head H comprises a flexible drive shaft 10 having a shank 12 to be held in the chuck of an electric drill or the like used for operating the tool. The flexible drive shaft is secured to the upper end of a shaft 14 having a head 22 fixed on its lower end. A collar 16 surrounds thehead 14 and is suitably notched as at 17 to receive hone-carrying arms 18 which also extend through notches 23 of the head 22.

The arms 18 are provided with shoulders 19 which act as pivots at 20 with respect to the head 22 and beyond the pivots are ends 24 coacting with a cone 26 for adjustment purposes. A spring 28 biases the cone downwardly and thereby the ends 24 inwardly and the lower ends of the arms 18 outwardly, an adjusting nut 30 being threaded on the shaft 14 for changing the tension of the spring, all as disclosed in the Brooks patent.

I have provided a special type of honing member to be pivoted to the outer ends of the hone-carrying arms 18 in place of the cylinder hones disclosed in the Brooks patent. These comprise a hone-carrier 32 for each arm 18. The hone carrier is pivoted to the arm at 33 and has a supporting roller 34 journaled on a pin 35 and adapted to engage and roll on the upper end of a cylinder 42 of an internal combustion engine or the like which has a bore 44. The hone carrier 32 has a contact element 36 adjacent its lower end adapted to contact and ride on the cylinder bore 44 during the operation of the tool.

The cylinder 42 is illustrated as having a ridge 46 caused by wear of the bore 44 to larger than its original diameter by the piston rings of the piston which reciprocates in the cylinder. The upper limit of movement of the upper edge of the top piston ring is slightly below the top of the cylinder 42 and thereby the ridge 46 is left unworn and is a problem when fitting new oversize pistons and rings which usually must be inserted from the top of the cylinder. Even if inserted from the bottom, the upper surface of the top ring of the new piston would strike the ridge and result in breakage of the ring. Accordingly, it is necessary to remove the ridge.

Heretofore, these ridges have been removed by ridge reamers such as those of the type show-n in Brooks [Patent No. 2,780,115. By providing my herein disclosed type of cylinder ridge hone, the ridges may be: honed away instead of reamed away. For this purpose, a hone element 46 is cemented to the hone carrier '32 in position to overspan the ridge 46 as shown in FIG. 2. The hone carrier may be advantageously provided with a shoulder 38 as shown in FIG. 4 against which the home element 40 is cemented and the shoulder faces the direction of rotation (arrow 50) so as to back up the hone without depending entirely on the cement to hold it to the hone carrier.

At the beginning of the ridge honing operation as shown in FIG. 2 the surface of the hone element 40 contacting the ridge 46 may be substantially vertical when the contact element 36 contacts the cylinder bore 44. As the ridge is honed away the face angle of the hone changes so that finally as in FIG. 3 after the ridge (shown dotted) has been slightly more than completely honed away a conical surface 48 is provided for the upper end of the bore 44. This conical surface has the advantage of facilitating the entry of the new piston rings into the cylinder after the honing operation.

As shown in FIG. 5 the contact element 36 may be replaced by a roller 52 if desired to reduce the frictional drag of the honing member during rotation of the tool. A change of this character and others may be made in the construction and operation of my cylinder ridge hone without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents which may reasonably he include within their scope.

I claim as my invention:

1. In a cylinder ridge hone of the class described, a rotatable head, a plurality of hone-carrying arms pivoted thereto and extending therefrom, means biasing said arms outwardly, and cylinder ridge honing members carried by the outer ends of said arms and comprising hone carriers pivoted intermediate their ends to said arms and each adapted to enter a cylinder bore adjacent a ridge thereof, a contact element on lower end of said hone carrier adapted to contact and ride the cylinder bore below such ridge, a hone element on upper end of said hone carrier adapted to contact and hone such ridge, said contact elements projecting outwardly beyond the extended plane of the honing face of said hone element, supporting means on said hone carrier adapted to contact and ride the upper end of the cylinder when said head is rotated, said supporting means comprising rollers journalled on horizonal axes on said hone carriers, the bias imparted to said arms being effective to retain said contact elements and said hone elements in contact with the cylinder bore and such ridge, respectively, during such rotation, and to feed the hone elements into the ridge for honing it away to such extent as to produce a conical shape to a portion of the cylinder bore in place of the ridge thereof when the honing operation is completed.

2. A cylinder ridge hone according to claim 1 wherein said hone carriers have shoulders facing the direction of rotation and said honing elements are cemented to said hone carriers against said shoulders.

3. In a cylinder ridge bone, a rotatable head, a plurality of hone-carrying arms pivoted thereto and extending angularly therefrom, the outer ends of said arms defining a diameter, means biasing said arms toward a maximum diameter position, and cylinder ridge honing members carried by the outer ends of said arms and comprising hone carriers pivoted to said arms and having a first portion adapted to enter a cylinder bore adjacent a ridge thereof and a second portion adapted to overhang the upper end of the cylinder above such ridge, a contact element on said first portion adapted to contact and ride the cylinder bore below such ridge, a hone element on said first portion adapted to contact and hone such ridge, supporting rollers journalled on horizontal axes between said first and second portions and adapted to contact and ride the upper end of the cylinder when said head is rotated, the bias imparted to said arms being effective to retain said contact elements and said hone elements in contact with the cylinder bore and such ridge, respectively, during such rotation and to feed said hone elements into the ridge for honing it away.

References Cited UNITED STATES PATENTS 1,910,940 5/1933 Toske 772 1,927,594 9/1933 Olson 772 X 2,736,146 2/1956 Brooks 51341 3,075,412 1/1963 Kushmuk 772 DONALD R. SCHRAN, Primary Examiner. 

1. IN A CYLINDER RIDGE HONE OF THE CLASS DESCRIBED, A ROTATABLE HEAD, A PLURALITY OF HOME-CARRYING ARMS PIVOTED THERETO AND EXTENDING THEREFROM, MEANS BIASING SAID ARMS OUTWARDLY, AND CYLINDER RIDGE HONING MEMBERS CARRIED BY THE OUTER ENDS OF SAID ARMS AND COMPRISING HONE CARRIERS PIVOTED INTERMEDIATE THEIR ENDS TO SAID ARMS END EACH ADAPTED TO ENTER A CYLINDER BORE ADJACENT A RIDGE THEREOF, A CONTACT ELEMENT ON LOWER END OF SAID HONE CARRIER ADAPTED TO CONTACT AN RIDE THE CYLINDER BORE BELOW SUCH RIDGE, A HONE ELEMENT ON UPPER END OF SAID HONE CARRIER ADAPTED TO CONTACT AND HONE SUCH RIDGE, SAID CONTACT ELEMENTS PROJECTING OUTWARDLY BEYOND THE EXTENDED PLANE OF THE HONING FACE OF SAID HONE ELEMENT, SUPPORTING MEANS ON SAID HONE CARRIER ADAPTED TO CONTACAND RIDE THE UPPER END OF THE CYLINDER WHEN SAID HEAD IS ROTATED, SAID SUPPORTING MEANS COMPRISING ROLLERS JOURNALLED ON HORIZONAL AXES ON SAID HONE CARRIERS THE BIAS IMPARTED TO SAID ARMS BEING EFFECTIVE TO RETAIN SAID CONTACT ELEMENTS AND SAID HONE ELEMENTS IN CONTACT WITH THE CYLINDER BORE AND SUCH RIDGE, RESPECTIVELY, DURING SUCH ROTATION, AND TO FEED THE HONE ELEMENTS INTO THE RIDGE FOR HONING IT AWAY TO SUCH EXTENT AS TO PRODUCE A CONICAL SHAPE TO A PORTION OF THE CYLINDER BORE IN PLACE OF THE RIDGE THEREOF WHEN THE HONING OPERATION IS COMPLETED. 